Pagesize for large-objects (ONLY) database.

Hello,
I am planning to have a postgres database for large object storage. I believe
that with version 9.0, the 'world readable' issue with pg_largeobject is
resolved and we can now control at object level- which users can read/write what
objects.

Streaming performance is an issue and hence will need to increase the PAGE SIZE
(BLCKSZ ) to ensure access is sequential. Does anyone have recommendation on a
BLCKSZ I can start with.
There will be lot of reads,updates,inserts,deletes of the objects. Also any
ideas on how big of an issue fragmentation can be and how can it be contained ?

About 70% of the objects will be less than 1MB, about 25% upto 10MB and rest 5%
or so may be larger than 10MB.

Metadata management is also important so just a distributed filesystem (rather
than database) is not viable. Any other suggestions are welcome.

Thank you! - AJ